There's just something about the background colors and his colors that just...WORK. I love how he's got bright eyes with the darker fur surrounding them. Nice pose and nice composition as well. He seems like an awesome dog to be able to work with you so well.
He's actually a Cardigan Corgi. They're the older breed of Corgi, but you simply don't see them around as often as you see the Pembrokes.
They're a bit larger of a dog, heavier boned, and will always have a tail. Plus they come in two extra colors that the Pems don't- blue merle (like Simon here) and brindle (like my other Cardigan, Caleb.)
His eyes are darn cool; I admit, I LOVE a dog with blue eyes.